CVE-2026-41872: Kura Sushi App Vulnerable to MITM via Improper Certificate Validation
The “Kura Sushi Official App,” developed by EPG, Inc., is susceptible to improper certificate validation, identified as CVE-2026-41872. This vulnerability carries a CVSSv3 score of 7.4 (HIGH) and stems from CWE-295, a common weakness. The National Vulnerability Database reports that this flaw could enable man-in-the-middle (MITM) attacks.
Attackers exploiting this vulnerability could eavesdrop on or alter push notification communications between the application and its servers. This presents a direct risk to user privacy and data integrity, as sensitive information transmitted via push notifications could be intercepted or manipulated without detection. The lack of robust certificate validation allows an attacker to impersonate legitimate servers.
For defenders, this highlights a critical blind spot in mobile application security: the often-overlooked push notification channel. While product-specific patches will be necessary from EPG, Inc., organizations should generally enforce stringent certificate pinning in their mobile applications to prevent such MITM scenarios. Assume that any communication not explicitly validated is compromised.
What This Means For You
- If your organization develops or relies on mobile applications for critical communications, scrutinize their certificate validation mechanisms. Improper certificate validation, as seen in CVE-2026-41872, is a fundamental security flaw that attackers will always target. Audit your mobile app development practices to ensure certificate pinning is a mandatory control, especially for push notification channels.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-41872: Kura Sushi App MITM via Improper Certificate Validation
title: CVE-2026-41872: Kura Sushi App MITM via Improper Certificate Validation
id: scw-2026-05-12-ai-1
status: experimental
level: high
description: |
Detects potential Man-in-the-Middle (MITM) attacks targeting the Kura Sushi Official App (CVE-2026-41872). This rule looks for suspicious network traffic to the EPG, Inc. domain on a specific path commonly used for push notifications. The vulnerability allows attackers to intercept and alter these communications due to improper certificate validation.
author: SCW Feed Engine (AI-generated)
date: 2026-05-12
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41872/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: proxy
detection:
selection:
dst_domain|contains:
- 'epg.co.jp'
cs-uri|contains:
- '/push/notification'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41872 | Improper Certificate Validation | Kura Sushi Official App |
| CVE-2026-41872 | Man-in-the-Middle | Push notification communication |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 12, 2026 at 09:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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